I found some neat mythology about winter that I also wanted to share:
In Persian culture winter is called Yalda (birth). It is referred to as the eve of the birth of Mithra who symbolized light, goodness and strength on earth.
In Greek mythology, Hades kidnapped Persephone to be his wife. Zeus demanded Hades to return her to the goddess of Earth and her mother, Demeter. Instead, Hades tricked Persephone into eating the food of the dead so Zeus decreed that Persephone would spend 6 months with Demeter and 6 months with Hades. So, Demeter, out of depression during the 6 months that her daughter is with Hades, created winter.